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2021-04-12 / V1.1
Maintenance
Contactors CP Series – Installation and Maintenance Instructions
9. Maintenance
Note the expert knowledge which is essential for car-
rying out maintenance work, mentioned in chapter
“2. General and security information”.
9.1 Safety
DANGER
The contactors are high voltage switches. The touching of electrically conducting parts may result
in serious injuries or even death!
Energized parts are all metal parts belonging directly to one of the circuits or wires leading there. All
other visible metal parts and wires may also be energized in the case of a failure.
Before beginning any work on the contactors, always observe the following safety regulations:
X
Disconnect on all sides
X
Ensure that it is not possible to reconnect unintentionally
X
Clearly mark your work area
X
Make sure that there is no voltage present
X
Earth and short circuit the installation; this also includes the discharging of any capacitors in
the main circuit
X
Besides the main electric circuit, also disconnect additional and auxiliary circuits
X
Cover or insulate adjacent energized parts
X
Only an electrically skilled person may determine if there is no voltage present
X
When the work has been concluded, proceed the other way round.
9.2 Preventive maintenance
The CP contactors are maintenance-free within the rat-
ed mechanical life time. The electrical life time depends
on the number of switchings under heavy load condi-
tions and may vary for dierent applications. In normal
use, this corresponds to a decade-long operating pe-
riod.
9.2.1 Intervals for regular checks
To ensure the correct function and a prolonged opera-
tional life span of the contactors, the following checks
and maintenance must be performed regularly.
Checks Interval
Visual inspection of
the contactor from
outside
X
1x per
year
Inspection of the main contacts, both
xed and movable contacts (this check is
only required for devices with arc cham-
ber, not permissable for devices without
arc chamber)
X
1x to 2x
per year
Inspection of the auxiliary switches
X
Every
2years
If the contactors are operated in particularly dirty envi-
ronments, the checking intervals for visible inspections
should be shortened, because dirt can impair the insu-
lation clearances and there is therefore the possibility
of a shorter service life or an operational fault.
Extraordinary services need only be carried out if there
has been a signicant and extraordinary recorded num-
ber of switchings under fault conditions.
DANGER
When damages on the contactor, high
voltage cables, busbars or earthing ca-
bles are visible, the safety of the contac-
tor is no longer guaranteed.
X
Immediately give damaged con-
tactors to corrective maintenance.
X
Immediately replace all damaged
components with new compo-
nents.
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